This is a “critical” update and affects all supported IE configurations from IE5.01 to IE6 for XPSP2. It is also a cumulative update. It includes hotfixes that have been released since the release of MS04-004 or MS04-025 but they will only be installed on systems that need them.

I encourage everybody to download these updates and other non-IE updates via Windows Update. Windows users are also strongly encouraged to turn on automatic updates on their systems so updates are downloaded more easily.